Channel-ordered (mu, sigma) tuples not saved via Serde package

I am trying to save a model I created as a .binpb file. I had used custom priors for each channel that were saved as a tuple, the model runs and can be saved as a .pkl file, but when I run meridian_serde.save_meridian(mmm, file_path), I get the following error:

2 meridian_serde.save_meridian(mmm, file_path)

5 frames
/usr/local/lib/python3.12/dist-packages/schema/serde/distribution.py in _to_parameter_value_proto(self, param_name, value, dist)
260
261 # Handle unsupported types.
--> 262 raise TypeError(f"Unsupported type: {type(value)}, {value}")
263
264 def _from_distribution_proto(

TypeError: Unsupported type: <class 'tuple'>, (1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0)

Reproduce the failure through meridian_serde.save_meridian(mmm, file_path) using the channel-ordered tuple priors, then inspect schema/serde/distribution.py around _to_parameter_value_proto. Compare the successful .pkl save with the failing .binpb path; done means models using these tuple-valued custom priors can be saved as .binpb without the Unsupported type error.